EP3719936A1

EP3719936A1 - Connector device

Info

Publication number: EP3719936A1
Application number: EP20166608.8A
Authority: EP
Inventors: Daniela GRAZIANO; Federico LUPO; Federico VIRDIA; Riccardo Francesco ROBONE; Alessandro LAMACCHIA
Original assignee: TE Connectivity Italia SRL; TE Connectivity Italia Distribution SRL
Current assignee: TE Connectivity Italia SRL; TE Connectivity Italia Distribution SRL
Priority date: 2019-04-02
Filing date: 2020-03-30
Publication date: 2020-10-07
Anticipated expiration: 2040-03-30
Also published as: CN111799596A; US11387597B2; EP3719936B1; EP4084235A1; US20200321724A1

Abstract

Connector component for a connector suitable to reduce the heat dissipation and flame propagation within an appliance in which the connector is fitted comprising at least one plate and at least two fastening means for securing the connector component to the external surfaces of a connector housing, the connector component being made of a metal or plastic material having high inflammability resistance and being adapted to extend on more than one of the external surfaces of the connector housing.

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a connector component which can be fixed on a connector housing with a fastening mechanism, which connector component helps preventing heat dissipation or flame propagation from heat affected areas of the connector to the surrounding parts.
The invention also relates to a connector product made by a connector housing and the connector component and to a method of assembling such connector product.

BACKGROUND OF THE INVENTION

'Raster Anschluss Steck Technik' (RAST) is a modularized connector system widely used in home appliances. RAST connectors are based on regular pitch connection plug technology and are used, next to household appliances, also in automobiles and industrial control systems for electrical connection between electronic components such as wires and circuits boards. Due to the increase of the functions of household electrical appliances, the number of connectors for connecting function modules to the main controller is increasing correspondently. The standardized and modularized RAST connector system may be integrated with multiple single devices and a plurality of connectors, optimizing installation time and minimizing the risks of errors while minimizing the space occupied on the PCB and the manufacturing costs.
In the appliance global market, RAST and other types of connectors must fulfill specific requirements and pass specific tests which simulate the working conditions within a house appliance.
In particular, in order to get the approval of RAST or other types of connector products by the global appliance customers, the nichrome wire test on flammability must be fulfilled. Heat and flames generated inside a connector should not spread from the connector area into the surrounding parts. The nichrome wire test was introduced in the UL standard for different household appliances. Example of these standards are: UL 749[1] for dishwashers, UL 2157[2] for electric clothes washing machines and extractors and UL 2158[3] for electric clothes dryers. The result of the nichrome wire test depends from multiple factors, which make it a complex test. It is closely related to the geometry and the type of plastic material used for the connector, for the counterpart and for the surrounding parts, the orientation of the connector inside the household appliance and the distance of the surrounding parts above the connector part.
US8057261 discloses a connector with a housing adapted to receive a flag terminal. The connector comprises an L-shaped housing into which the flag terminal can be inserted. The connector is partially insulated by the housing and has a rear opening for inserting the flag terminal. In order to comply with the proposed standards for consumer appliances, the connector has to be fully insulated in order to avoid accidental contact with exposed terminals. Thus, a rear cover is provided that can be mechanically pushed into the rear opening. The rear cover features tabs that are latched onto the respective apertures of the housing. The housing and cover are composed of an electrical insulating plastic, such as nylon. In order to reduce the risk of flame propagation or heat dissipation to the surrounding area, the housing and cover can be composed of flame retardant nylon compound.
Disadvantage of this system is that the cover is an additional part which must be installed by mechanically pushing it into the terminal opening. Also, as the shape of the cavity and the capture mechanism employed can differ for different flag terminals, the shape of the cover must be adapted so that each cover has a design specific to each flag terminal. Additionally, the cover is installed by pushing it into the terminal, meaning that the choice of the material is limited as the material chosen for the cover must be mechanically compatible with the material of the housing. Also, the main function of this cover is to isolate the electric wires, but not the terminal, therefore the flame-retardant features will be relevant only for a limited portion of the connector. Finally, this system has the disadvantage of being intended to be installed by a machine only.
US9692163 discloses a connector comprising a housing with a rear opening for inserting a terminal into the housing. The housing features tabs enabling a rear cover to be latched onto the housing closing the rear opening. The cover contains a plurality of retaining arms for receiving the tabs. The cover is fitted externally onto the housing and closes the housing after insertion of the terminal. The housing comprises a material that provides the housing with electrically insulating properties.
This system does not address the main need of fulfilling the flammability test as the major surface of the terminal is not protected by the cover. Also, this system has a quite complex geometry and construction.

SUMMARY OF THE INVENTION

The present invention has been made in view of the disadvantages of the prior art, and the object thereof is to provide a component for RAST or other types of connectors preventing heat dissipation or flame propagation from affected areas of the connector, which system is done of a flame retardant material and has a design and construction which can be easily adapted to be used with different kind of geometries and materials in different systems. Moreover, the component can be assembled by the end user.
These objects are solved by the subject matter of the appended independent claims. Advantageous embodiments of the present invention are the subject matter of the appended dependent claims.
According to the present invention, a connector component for a connector suitable to reduce the heat dissipation and flame propagation within an appliance in which the connector is fitted is provided, which connector component comprises at least one plate and at least two fastening means freely protruding out of that plate for securing the connector component to the external surfaces of the connector housing, is made of a metal or a plastic material having high inflammability resistance and is adapted to extend on more than one of the external surfaces of the connector housing. The one plate and two fastening means allow joining in the correct manner the connector component with the connector housing by mean of mechanical connection. The fastening means are secured to the plate by one extremity or side, while the other extremities or sides are not connected to the plate in any part. The advantage of this connection of the fastening means to the plate is that the position and the dimensions of the plates and of the fastening means can be modified depending on the particular area of the connector to be protected, hence reducing the amount of high-inflammability resistance material necessary to build the connector component. The plate and the fastening means are designed to be adapted to different kind and shapes of connectors and are all done with the same material, being metal or plastic so that the fastening means themselves not only fulfill the function of fixing the connector component on the connector housing, but also prevent flame distribution. The plate and the fastening means extend on more than one of the external surfaces of the connector housing to ensure that possible heat and or flames generated within the connector will not spread around. The connector component with one plate and two fastening means only can be easily adapted to fit different kind of connectors geometries. The fastening means guarantee a stable mechanical connection with the connector housing. At the same time, since the fastening means secure the connection of the connector component to the connector housing in a releasable manner, disassembly of the component from the housing is facilitated. The high inflammability resistance will assure protection of the connector in case of overheating inside the appliance. Metal assure an easier processability also at low costs.
According to a further embodiment of the invention, the connector component comprises a first plate and a second plate and wherein the first and second plates have a rectangular shape. Advantage of having two plates instead than one is to increase the mechanical stability of the connector component on the connector housing and increase the performances of the system subject to the flammability test, because a larger area of the connector housing will be protected. The two plates can be arranged on the connector housing in such way to cover the areas of the connector which are mostly affected by the heat, which depends from how the connector is positioned inside the appliance. The number of plates is however not necessarily limited to two, the number may be increased according to the structural needs. The rectangular shape will assure having an easy geometry, which is easy to manufacture and will be easily adaptable to different kind of connector and will assure having a large flat surface covering the connector housing. Other configurations are possible for example configurations in which the plates have different geometries or the number of plates and fastening means is increased.
According to a further embodiment of the invention, the plates are joined perpendicularly to each other in an L- shape. The L-shape is easy to produce, secures a stable connection with the connector housing and allows complete coverage of two surfaces of the connector housing which can be the surfaces mainly affected by the heat. One of the plates of the connector element will be placed on top of the connector housing and the other will cover a side surface.
According to a further embodiment of the invention, the fastening means are L-shaped elements comprising two perpendicular parts and extending from two opposite edges of the first plate, in a way that only one side of one part of the L-shaped element is connected to the first plate and the other sides are free. This configuration allows fixing the connector component in a stable way on the connector.
According to a further embodiment, the fastening means are L-shaped elements comprising two perpendicular parts and extending from two opposite edges of the first plate, in a way that only one side of one part of the L-shaped element is connected to the first plate while the other sides are free, and in a way that the part of the L-shaped elements connected to the first plate is oriented perpendicularly to the first plate and the second part is oriented towards the inside of the second plate. This configuration allows stable fixing of the connector component in the connector and, if necessary, it also allows sliding in the connector component on the connector.
According to an additional embodiment, the fastening means are plates extending from two opposite edges of the first plate in a direction parallel to a second plate and tilted towards the inside of the first plate, the two fastening means having hooking portions at their ends oriented towards the outside of the second plate. In this case a bigger portion of the connector can be covered.
According to an additional embodiment, the fastening means are rectangular elements extending from part of the two opposite edges of the at least one plate parallel to each other and perpendicular to the at least one plate, wherein one side of the rectangular elements is at least partially connected to the at least one plate and the other sides of the rectangular elements are free. The advantage of this configuration is that the dimensions of the fastening means can be easily adapted to the dimension of the area of the connector to be protected.
According to an additional embodiment, the fastening means are rectangular elements freely extending from part of the two opposite edges of the at least one plate parallel to each other and perpendicular to the at least one plate, the fastening means being bigger, for example larger and/or wider, than the at least one plate and the fastening means being provided with hooking elements at their end. In those cases the lateral plates of the connector component function as both covers protecting the component from flames and heat and fastening means to fix the cover component to the connector.
According to a further development, the fastening means are rectangular elements freely extending from part of the two opposite edges of the at least one plate parallel to each other and perpendicular to the at least one plate, the fastening means , being smaller, for example less wide, than the at least one plate. This further different geometry can be adapted to different connectors and appliances shapes.
All the solutions discussed assured that the connector component can be also easily removed from the connector.
According to a further embodiment of the invention, the fastening means are latches, which will assure a good grip, but may also be any other kind of gripping means.
According to an additional embodiment, the connector component is made of high thermal resistant polymers, in particular it is made of polyphenylensulfid. The choice of this material allows having a connector assembly able to withstand high thermal stress and fulfill the new test requirements described above.
If needed, some parts of the connector component can be made of different materials with different chemical-physical properties and thermal resistances.
According to a further embodiment of the invention, a connector product is provided comprising a connector housing having external surfaces adapted to engage fastening means, a cavity for receiving an electric wire, an insertion slot perpendicular to the wire receiving cavity for receiving a metallic contact and a connector component suitable to reduce the heat dissipation and flame propagation within an appliance in which the connector is fitted extending on more than one of the external surfaces of the connector housing. Such a connector product is particularly recommendable for household appliances as it will fulfill the new flammability requirements and security standards.
According to a further development, the connector component of the connector product is made of a material having a higher inflammability resistance than the material of the housing. The high inflammability resistance will assure protection of the connector in case of overheating inside the appliance.
According to an additional development, the connector product is a power connector.
According to a further development, a house appliance comprises a connector component as described above. As discussed above, such a household appliance will fulfill the nichrome wire test requirements introduced in the UL standard.
According to a further improvement, the method of assembling the connector product comprises the steps: molding a connector housing; inserting a metallic contact and inserting an electric wire; where the connector component is latched on the connector housing before or after inserting the metallic contact, or before or after inserting the electric wire
According to a further development the method of assembling the connector product comprises the steps: molding a connector housing; inserting a metallic contact; inserting an electric wire; where the connector component is latched on the connector housing during the appliance assembly.
The accompanying drawings are incorporated into and form a part of the specification for the purpose of explaining the principles of the invention. The drawings are not to be construed as limiting the invention to only the illustrated and described examples of how the invention can be made and used.
Further features and advantages will become apparent from the following and more detailed description of the invention as illustrated in the accompanying drawings, in which:

Fig. 1 shows the connector component comprising two plates joined perpendicularly to each other and one type of side fastening means
Fig. 2 and Fig. 3 show a connector product comprising a connector housing and the connector component of Fig. 1 in two different perspectives
Fig. 4 illustrates the connector component comprising two plates joined perpendicularly to each other and an alternative type of side fastening means
Fig. 5 and Fig. 6 show the connector product comprising a connector housing and the connector component of Fig. 4 in two different perspectives
Fig. 7 shows the connector component comprising two plates joined perpendicularly to each other and side fastening means consisting of plates and hooking portions
Fig. 8 and Fig. 9 are perspective views of the connector product with the connector component of Fig. 7
Fig. 10 is a further configuration of the connector component comprising one plate only and two side plates as latching elements
Fig. 11 and Fig. 12 are perspective views of the connector product with the connector component of Fig. 10
Fig. 13 shows the connector component in which the fastening means are stripes extending out of one plate
Figs. 14 to 17 are views of the connector product comprising the connector component of Fig. 13, the housing, housing counter-part and relative terminals

DETAILED DESCRIPTION OF THE INVENTION

The present invention will now be more fully described hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In particular, although certain features of the exemplary embodiments below will be described using terms such as "top", "bottom", "front", "rear" and "side", these terms are used for the sole purpose of facilitating the description of the respective features and their relative orientation and should not be construed as limiting the claimed invention or any of its components to a use in a particular spatial orientation. Like numbers refer to like elements throughout the description. Fig. 1 represents the connector component comprising two plates 101 and 102 joined perpendicularly to each other and fastening means 103 and 104. The two plates have a rectangular or squared shape and may have the same dimension or different dimensions to be adapted to different connector geometries. Preferably the second plate 102 is bigger than the first plate 101. The fastening means 103 and 104 are L-shaped elements freely protruding out of the plate 102 and having only one extremity connected to the plate 102. The fastening means 103 and 104 are positioned at the end of the plate 102 and are oriented toward the inside of the plate 102.
Fig. 2 and Fig. 3 show a connector product 101 comprising a connector housing 105 combined with the connector component 100 of Fig. 1 in two different perspectives. The connector housing 105 showed in the picture is a RAST type of connector, known as 'AMP multifitting mark II', however also other types of connectors, with different shapes and features, can be combined with the connector components of Fig.1 in a connector product.
As shown in the figures, the component or cover 100 it is externally fastened to the connector, in particular, it is reversibly inserted on the connector by simply sliding the fastening means inside the two slots 112 on the side of the connector, which are configured to mechanically engage with the fastening means. As visible in Fig 3, the plate 102 of the cover will be directly in contact with the connector on its rear surface 107, while the plate 101, positioned on top of the connector, will be separated from the top surface 110 by a gap. Alternatively, there could be a gap between the rear surface 107 and the plate. The other connector housing surfaces, i.e. the side surfaces 108 and 109, and the front surface 106, perpendicular to the side surfaces and the bottom surface 111 are not covered. This should be considered only as one possible configuration. Another configuration foreseen that at least one of the plates, is bigger than the surface of the connector housing that will be covered. Alternatively, instead than having two plates, the connector component or cover can also have only one plate (image not shown).
During the flammability test on the connector itself, the area of the connector which is most affected by the heat is identified. The test is performed as described in the UL standard. For example samples may be subjected to a test current of 11 Amp for 20 minutes induced by an energized nichrome wire coil. A condition of overheating is generated, which will cause melting of the connector housing.
The test allows to verify that the thermal stresses that will act on the connector within a house appliance are not homogeneously distributed, some portions will be subjected to higher stress, some to lower. For this reason, only some portions, as for example in this case 107 and 110, require shielding from the surrounding by the connector component or cover, some others, like 106, 108, 109, 111, do not need to be shielded. The connector component 100, is made by a material with higher flammability resistance than the connector itself. For example, looking at the component in Figs 3-4 the top surface 110 and the rear surface 107 of the connector housing 104 melted under test conditions and thus require to be covered with the component 100 when mounted within a house appliance.
The cover, or the flame retardant cover 100, can be made of high thermal resistance polymers, such as preferably, polyphenylenesulfide. Other suitable materials are polyamide, or polybutylene terephthalate or polyethylene terephthalate and polycarbonate or any other plastic materials that can prevent heat and flames from spreading from the connector area to the surrounding parts within the appliances. Also other forms can be used, such as liquid crystal polymers. Alternatively metals can also be used.
Fig. 4 shows a different type of connector component or cover geometry, in which the two plates 101 and 102 are joined perpendicularly to each other and the fastening means or side latches 203 and 204 are connected to the plate 101 by one of their extremities and extend from the first plate along the sides of the second plate. The fastening means or side latches comprise at their end hooking portions 203' and 204' projecting toward the inside part of the second plate 102.
Fig. 5 and Fig. 6 show the connector product comprising a connector housing 105 of the kind of that described above for Fig. 2 and Fig. 3, and the connector component 100 of Fig. 4 in two different perspectives. Also in that case the connector component or cover can be slid over the connector housing 105 and be positioned there where the protection with high thermal resistance material is needed. The fastening means or side latches 203 and 204 will at the moment of insertion through the slits 112 be forced to temporarily deformed towards the outside, and as soon as the cover is in the final position, the terminal parts of the fastening means or side latches 203' and 204' will mechanically engage the housing. Alternatively, instead then having two plates, the connector component or cover can also have only one plate (image not shown).
If a higher surface needs to be covered, the cover of Fig. 7 could be rather used. In that case, the plated 301 and 302 have a similar configuration as that of the other connector components, but the fastening means or side latches 303 and 304 are plates having rectangular shape freely extending out of the plate 301 and tilted of a certain angle towards the inside of the second plate 302. The fastening means or side latches 303 and 304 have their ends 303' and 304' tilted towards the outside of the second plate to form rounded hooking portions extending along the length of the fastening means or side latches. This kind of connector component can be used to assure partial coverage of the side surfaces 108 and 109 of the connector as represented in Fig. 8 and Fig. 9. The component is inserted with a different mechanism, i.e. it is inserted form the top and the side latched will exercise a pressure on the side surfaces 303 and 304 which will help keeping the cover in place on the housing.
The material used are same as described above.
For situations in which the top surface 110 of the connector does not need a cover, while the sides 108 and 109 can be protected, the cover or component of Fig. 10 can be used. This cover comprises one plate 402 only and two side plates 403 and 404 as latching elements which are extending from at least part of the edges of the plate 402. The latching elements comprise end portions 403' and 404' which have a U shape. When positioned on the connector housing 105, as shown in Fig. 11 and Fig. 12, the front surface will be covered in part, and the side surfaces 108 and 109 will be protected by the fastening means or side latches. The element will be slid in from the top of the connector housing through the slits 112 and the fastening means or latches will be locked within the slits 112 by the U formed end portions 403' and 404' extending along the all length of the slits.
A further possible configuration is shown in Fig. 13 showing the connector component or cover build with only one plate 501 and two stripes 503 and 504 extending out of the one plate 501 functioning as fastening means. The component will be connected to the connector by co-molding or mechanically.
Figs. 14 to 17 are perspective views of the connector product comprising the connector component 500 of Fig. 13, the housing 505 and terminals 512. Specifically in Fig. 14 and Fig. 17 the counter part of the housing shown in the other examples is represented, while in Fig. 15 and Fig. 16 the housing and its counterpart are combined. In those cases appears evident that the connector product can cover also the final assembly of a product. The connector component 500 can be mated on the connector housing itself during connection termination (insertion electric wire) or during the appliance assembly. In both cases, as the appliances is being assembled, the component or cover 500 is mated onto the connector housing 505 via fastening mechanism and can for example be snapped or onto the connector. Alternatively, the component 500 can in also be co-molded on the connector housing, only during the appliance assembly.
The component can be used to meet the standards for consumers appliances, such as dishwasher and should prevent the surrounding parts from catching fire.
The above mentioned embodiments are intended to be illustrative and not restrictive. For example, as discussed for Fig. 2 and Fig 3. at least one of the plates, can be bigger than the surface of the connector housing that will be covered. For example many modifications may be made to the above embodiments by those skilled in the art, and various features described in different embodiments may be freely combined with each other without conflicting in configuration. The principles of the present invention can also be extended to existing other RAST products, and advantageously applied to other types of housings.

Claims

Connector component (100, 300, 400, 500) for a connector suitable to reduce the heat dissipation and flame propagation within an appliance in which the connector is fitted, said connector component comprising:
at least one plate (101, 102, 301, 302, 402, 501) and

at least two fastening means (103, 104, 203, 204, 303, 304, 403, 404, 503, 504) for securing the connector component (100, 300, 400, 500) to the external surfaces (106, 107, 108, 109, 110, 111) of a connector housing (105, 505), said fastening means freely protruding out of said plate,

characterized in that

the connector component (100, 300, 400, 500) is made of a metal or plastic material having high inflammability resistance and is adapted to extend on more than one of the external surfaces (106, 107, 108, 109, 110, 111) of the connector housing (105, 505).
The connector component (100, 300, 400, 500) according to claim 1, wherein the connector component comprises a first plate (101, 301) and a second plate (102, 302) and wherein the first and second plates have a rectangular shape.
The connector component (100, 300, 400, 500) according to claim 2, wherein the plates (101, 102, 301, 302) are joined perpendicularly to each other in an L- shape.
The connector component (100, 300, 400, 500) according to claim 2 or 3 wherein the fastening means (103, 104) are L-shaped elements freely extending from two opposite edges of the second plate (102).
The connector component (100, 300, 400, 500) according to claim 4 wherein the fastening means (103, 104) have one part of the L-shape elements oriented in a direction perpendicular to the second plate from which the fastening means are protruding and the second part of the L-shape elements oriented towards the inside of the second plate.
The connector component (100, 300, 400, 500) according to claim 2 or 3 wherein the fastening means (303, 304) are plates (303, 304) extending from two opposite edges of the first plate (301) in a direction parallel to a second plate (302) and tilted towards the inside of the first plate (301), the two plates having hooking portions (303', 304') at their ends oriented towards the outside of the second plate (302).
The connector component (100, 300, 400, 500) according to claim 1, wherein the fastening means (303, 304) are rectangular elements freely extending from part of the two opposite edges of the at least one plate (402) parallel to each other and perpendicular to the at least one plate (402),.
The connector component (100, 300, 400, 500) according to claim 7, wherein said fastening means are bigger than the at least one plate and they are provided with hooking elements (403', 404') at their end.
The connector component (100, 300, 400, 500) according to claim 7, wherein said fastening means are smaller than the at least one plate (501).
The connector component (100, 300, 400, 500) according to claim 1 wherein the fastening means are latches.
The connector component (100, 300, 400, 500) according to claims 1 to 10, wherein the connector component (100, 300, 400, 500) is made of high thermal resistant polymers.
The connector component (100, 300, 400, 500) according to claims 1 to 11, wherein the connector component (100, 300, 400, 500) is made of polyphenylensulfide.
A connector product (101, 501) comprising:
a connector housing (105, 505) having external surfaces (106, 107, 108, 109, 110, 111) adapted to engage fastening means;

a cavity for receiving an electric wire;

an insertion slot perpendicular to the wire receiving cavity for receiving a metallic contact; and

a connector component (100, 300, 400, 500) suitable to reduce the heat dissipation and flame propagation within an appliance in which the connector is fitted extending on more than one of the external surfaces of the connector housing according to any of the preceding claims.
The connector product of claim 13 wherein the connector component (100, 300, 400, 500) is made of a material having a higher inflammability resistance than the material of the housing.
The connector product according to claim 13 or 14, wherein the connector product (101, 501) is a power connector.
House appliance comprising a connector component (100, 300, 400, 500) according to one of the claims 1 to 12 or a connector product (101, 501) according to any of claims 13 to 15.
Method of assembling a connector product (101, 501) according to any of claims 13 to 15 comprising the following steps:
molding a connector housing (105, 505);

inserting a metallic contact;

inserting an electric wire;

characterized in that

the connector component (100, 300, 400, 500) is fastened on the connector housing (105, 505) before or after inserting the metallic contact, or before or after inserting the electric wire.
Method of assembling a connector product (101, 501) according to any of claims 13 to 15 comprising the following steps:
molding a connector housing (105, 505);

inserting a metallic contact;

inserting an electric wire;

characterized in that

the connector component (100, 300, 400, 500) is latched on the connector housing (105, 505) during the appliance assembly.